Well, I'm a week into my 3s now (first time going this heavy) and my elbows are feeling slightly pained. Do they just need to get used to the weight you think?
I may just have to make this only one week of 3s, cut the cycle short, and continue into the 15s after my SD. I'll have to see how today's workout goes.
Either way I want them used to the 3s because I like doing them!